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This D3.js starter chart uses a bar chart to visualize the distribution of operating system values from a CSV file, showing over nine thousand Ubuntu instances against a small CentOS count. The code loads data via the `csv` method, then uses `scaleLinear` and `scaleBand` to map values to screen coordinates. Rectangles are appended to an SVG with `selectAll`, and the `enter()` selection applies the computed widths and heights, filling each bar with steel blue. The chart is rendered entirely through D3 version 7’s declarative API.